Billie herself chimed in: "omg."
Spears, currently on hiatus from her delayed Domination residency in Las Vegas, posted a dance video late Monday night in which she grabs a stuffed snake and re-creates her famous "I'm a Slave 4 U" choreography from the 2001 MTV VMAs, but this time set to Eilish's No. 2 Billboard Hot 100 hit "Bad Guy."
"Great song !!" Spears wrote in the caption, alongside the video filmed in her mansion, in which she swings a plush serpent around her head as she spins excitedly, leaps, falls to her knees and hops on top of a piano as the song plays in the background. "It made me pick up another [snake]," she wrote, using the snake emoji.